Strainer



UNITED sTATEs PATENT oEEIcE. v

RALPH S. CLARKE, OF WALPOLE, MASSACHUSETTS, ASSIGNOR T0 BIRD MACHINECOMPANY, A CORPORATION 0F MASSACHUSETTS.

STRAINER.

move coarse materials carried by a fluid it is especially applicable forarresting such materials carried bywater passing to a paper makingmachine and more particularly the water passing to shower pipes employed'for the purpose of cleaning felts or screens.

The main object of the invention is to provide a simple structure inwhich, by a manipulation of the parts the current may be caused to flowthrough the screening surface in a reverse direction having in view theremoval of the arrested material from the screen surface. i d

A. further object resides in the formation of the parts so that as thereversal of flow is set up a discharge valve will be automaticallyopened and the normal discharge line or passage closed.

A still further object resides in so forming the parts that the screensurface will' be subjected to a scraping action as it is shifted in theact of positioning the parts Ito effect the reversel flow.

The structure is illustrated in the annexed drawings wherein: ,I

Figure 1 is a vertical sectional view of the device with the parts intheir normal position, and

Fig. 2 is a similar fragmentary view showing the strainer so positionedas to'effect a reverse How therethrough and the discharge valve open.

In said drawings 1 denotes the main casting or body having an inlet 2,an outlet 3 for the strained fluid and a discharge port or opening 4through which the Afluid and the material removed thereby from thescreen pass during the reverse How.

Within thek upper part of the body there is formed a chamber 5 fromwhich the outlet 3. extends. The lower yorfbottom wall 6 ofSpecification of Letters Patent. Patented May 18, 1920. Application led.Tuly 26,

1919. Serial No. 313,652.4

`said chamber is provided with an annular openlng 7 and the upper end ofthe chamber is closed by a cap piece or cover 8 removably secured inplace by pivotally mounted bolts 9 and thumb-nuts 10. Said cover 1sprovided with an upwardly eX- tending lug or projection 11 which is interiorly threaded to receive a threaded stem or shaft carrying a crankat its upper end. A suitable packing nut or gland 14 is mounted on lug11 to provide a tight joint around the stem of shaft 12. The shaftimmediately below the threaded portion has secured to it anv annularhead or disk 15 while at the lower end thereof there is secured agrid-like head comprising a hub 16 an annular rim 17 and interconnectingspokes 18. An annular strainer element 19 formed preferably fromperforated sheet metal, as brass, is secured to the heads and they outerdiameter thereof is such that the outer surface of the strainer makes aclose fit with the wall of opening 7.

Extending across and within the body 1 and in a plane above thedischarge opening 4 is a cross partition or diaphragm 20 said partitionhaving an opening 21 formed therein.

The lower vend of the casting, or the discharge chamber thereof, isinteriorly threaded anddisk like member or nut 22 is mounted therein.Said disk carries a guide 23 for the downwardly extending stem 24: 0f aValve head 25 which latter carries a ring shaped washer 26 of rubber orthe like which normally bears against the under face of partition 20 andcloses the opening 21. The valve head is provided with an upwardlyextending lug or teat 27. d Resting upon the upper .face of nut or disk22 is a spring 28 which preferably takes the shape of` a cylinder formedfrom rubber and resting on the upper end of such spring is a lcap giece29 throughwhich the stem 24 passes. aid spring acting through the cappiece acts to force the valve to its closed position and to close theopening 21 and to consequently cut off the discharge ort 4.

With the parts in the position iii in Fig. 1 the water and the materialwhich' may be carried thereby enters the interior of* the body 1 or thecentral chamber thereof' through the port 2, thence through the'perforate head into the interior of' the ustrated strainer. Any coarsematerial will be ardownward rotary movement the exterior surface thereofwill be scraped by contact with the wall of opening 7 thereby cutting orloosening any protruding strings or the like. Continued downwardmovement of the strainer will finall bring the parts to the positionshown in ig. 2 wherein it will be seen that the opening 7 will be closedby head 15 and the valve 25 moved downwardly Jfrom its seat, the spring28 being placed under compression. At the 'Sametime the annular member17 of the lower head will contact with the upper face of partition 20and inasmuch as such elements are faced off or smooth a tight joint isformed therebetween. The incoming water will at such time be forced toflow inwardly through the screen surface and such iniow will remove .thepreviously arrested foreign matter and carry it downwardly through thelower grid-like head through opening 21 and to the discharge opening 4.

During the lowering movement of the screen no water may pass'tol theoutlet 3 which does not pass through the screen and' whenthe screenreaches its lowest position the chamber 5 and its outlet 3 are entirelyout oif. v

When the, screened surface is cleaned it is elevated throughmanipulation of shaft 12 and as it begins to rise or has moved to aslight extent valve 25 is automaticall closed through the action ofspring 28. akage about the valve stem. 24 is prevented vby using acylindrical shaped springas 28.

i' formed at one end thereof, a discharge- Ready access to the parts maybe had by removal of cap 8 and the n ut 22.

What is claimed is 1. In a strainer, the combination of acast-` ing orbody' having an outlet chamber chamber, and an intermediate inletchamber; a valve normally closing said discharge chamber from the inletchamber; a strainer located within the outlet chamber and incommunication with the inlet chamber; and means for moving the strainerinto the inlet chamber and opening the discharge valve. 2. In astrainer, the combination of a casting or body. having an outlet chamberformed at one end thereof, a discharge i chamber at the opposite lend,andan intermediate inlet chamber; a valve normally closing saiddischarge chamber from the inlet chamber; a strainer located within theoutlet chamber and movable through a ort or opening formed in that wallinterino 'ate the inlet .and outlet chambers, said strainercommunicating interiorly' with .the inlet chamber; and means for movingthe strainerl y through said opening into the inlet chamber saidstrainer as it nears its limit of inward movement contacting the valveand opening the same.

3. In a strainer, the combination of a casting or body having an outletchamber formed at one end thereof, a discharge chamber at the oppositeend, and an intermediate inlet chamber; a valve normally closing saiddischarge chamber from lthe inlet chamber; a strainer located within theoutlet chamber and movable through a port or opening formed in that wallintermediate the inlet and outlet chambers, said strainer communicatinginteriorly with the inlet chamber; and means for moving the strainerthrough said opening into the inlet chamber said strainer when movedinwardly to its full extent opening the valve and closing off theopening through which itis passed.

4. vIn a strainer, the combination of a casting or body having an outletchamber formed at one end thereof, a v discharge chamber at the oppositeend, and an intermediate inlet chamber; a valve normally closing saiddischarge chamber from the inlet chamber.; a strainer located within thef5.' In a strainer, the combination of a cast- Y ing or body having anoutlet chamber, a discharge chamben and an intermediate inlet chamber;la strainer located within' the outllet chamber and communicatinginteriorly with the inlet chamber; va valve normally closing a portleading from the inlet to=the discharge chamber; a valve stem extendindownwardly therefrom; a combined .nut an valve stem ide mounted in thelower portionlof the v ischar e chamber; a spring resting on the nut andacting to force the valve toits. seat; and means for moving the strainerdownwardly into the inlet chamber izo and into contact with the valve toopen the -1 latter against the actionl of the 6. In a strainer, thecombination of a casting orvbody` having an outletV chamber, a dischargechamber and an intermediate inlet chamber; a strainer located within theloutwith the Vinlet chamber; avalve normally closing a port leading fromthe inlet to the let chamber and communicating interiorly dischargechamber; a valve Vstem extending downwardly therefrom; a combined nutand valve stem guide mounted in the lower portion of the dischargechamber a cylindrical shaped spring restlng on the nut and encircling`the stem; a eap overlying and closing the upper end of said spring ;Vand means for moving the vstrainer downwardly into the inlet chamber andinto Contact with the valve to open the latter against the action of thespring. y

In testimony whereof I have signed my name to this specification.

RALPH S'. CLARKE.

